(S)-(-)-Leptophos (S)-Phenylphosphonothioic acid O-(4-bromo-2,5-dichlorophenyl) O-methyl ester 73307-67-2 BRN 2152663 Phosphonothioic acid, phenyl-, O-(4-bromo-2,5-dichlorophenyl) O-methyl ester, (S)-